Another casualty of the 1980s Cavalier.
Then a Peugeot 405....
Since then Mercedes..they make great seats, the cars are OK.
Seriously, the old AERO high back seat I find VERY comfortable. The Plus Four is possibly the best car MMC has ever made. With lower, better padded seats it would be perfect.
I read somewhere that the seats have to be a certain height to give a specific sight line to meet homologation rules. So I suspect there is nothing MMC can do. A good trimmer should be able to re-pad and lower slightly.